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Plastic injection mold

a technology of injection molds and injection holes, applied in the field of molds, can solve the problems of gate-white-flecks, shrinkage, weld marks, etc., and achieve the effect of improving product quality and reducing the number of defective products

Inactive Publication Date: 2011-11-08
CHENG UEI PRECISION IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This design reduces the number of defective products and enhances the quality of molded articles by ensuring uniform plastic flow, preventing issues like material shortage and shrinkage.

Problems solved by technology

However, the conventional gate design is apt to make the molded article disfigure, causing possible material shortage, weld marks, shrinkage, gate-white-flecks, warpage, brittleness, degradation, etc. when the molded article is very small and thin.

Method used

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  • Plastic injection mold
  • Plastic injection mold
  • Plastic injection mold

Examples

Experimental program
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Effect test

first embodiment

[0011]Please refer to FIG. 1, a plastic injection mold 1 of a first embodiment according to the present invention is shown. The plastic injection mold 1 includes a substantial rectangular upper insert 10 and a lower insert 20. A first mold core 11 is inserted in the upper insert 10. The lower insert 20 has a second mold core 21 disposed therein corresponding to the first mold core 11 of the upper insert 10 and projecting beyond a joint face of the lower insert 20. The first mold core 11 has a base 111 and an annular molding portion 112 protruded downwards from a periphery of a bottom of the base 111. A top of the second mold core 21 is matched with the bottom of the base 111, and an annular mold cavity 30 is formed between an inside of the molding portion 112 and an outside of an upper portion of the second mold core 21 when the upper insert 10 and the lower insert 20 are matched with each other. An annular gate 40 is formed under the molding portion 112 of the first mold core 11, w...

second embodiment

[0012]With reference to FIG. 3, a plastic injection mold 1′ in accordance with the present invention is illustrated. The injection mold 1′ has an upper insert 10′ and a lower insert 20′. The upper insert 10′ has a first mold core 11′ inserted therein, with a lower end protruded into the lower insert 20′. The upper insert 10′ and the lower insert 20′ are matched with each other to form an annular mold cavity 30′ located at an outer side of the lower end of the first mold core 11′, an annular gate 40′ under an outer side of a bottom of the first mold core 11′ and connecting with a lower portion of an inner side of the mold cavity 30′, and a substantial annular runner 50′ connected with an inner side of the annular gate 40′ (herein, it is defined that the annular runner also includes a round runner). In molding, the molten plastic material is injected into the mold cavity 30′ from the annular gate 40′ to form the plastic article 2.

[0013]As described above, the molten plastic material w...

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Abstract

A plastic injection mold for molding a plastic article includes an upper insert and a lower insert. The upper insert and the lower insert match with each other to define an annular mold cavity in between. An annular gate communicates with the mold cavity to allow molten plastic material to flow into the mold cavity to mold the article. An annular runner is connected with the annular gate for injecting molten plastic material to the annular gate. Molten plastic material will evenly flow into the mold cavity of the plastic injection mold through the annular gate to mold the plastic article, which prevents the plastic article from being disfigured, decreasing the number of defective products and improving the product quality.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a mold, and more particularly to a plastic injection mold for molding a plastic article.[0003]2. The Related Art[0004]Nowadays, plastic articles are mostly manufactured by injection molding method. In general, a plastic injection mold comprises an upper insert, a lower insert and a runner system. A mold cavity is defined between the upper insert and the lower insert when they are combined together. The runner system is provided for injecting molten plastic material from a nozzle of an injection molding machine to the mold cavity. The runner system generally includes a sprue, a runner and a gate. The sprue connects the nozzle and the runner. The gate is an entrance of the mold cavity. The molten plastic material is injected into the runner from the sprue, and then flows into the mold cavity through the gate to form plastic articles. As known by the skilled in the field, the gate directly ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B29C45/00
CPCB29C45/2616B29C45/2708
Inventor HE, PENGWU, XIAOPINGHO, SHIH-HSIUNG
Owner CHENG UEI PRECISION IND CO LTD